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Date: Mon, 15 Apr 2013 11:04:10 -0700
Message-ID: <CADPb22TTQCsFsuNtjTiUUQU_FN8R6cxfPeCRvNp_Ad2XS6XUag@mail.gmail.com>
Subject: Re: [RFA] Fix solib-precsave.exp,solib-reverse.exp
From: Doug Evans <dje at google dot com>
To: Pedro Alves <palves at redhat dot com>
Cc: gdb-patches <gdb-patches at sourceware dot org>
On Mon, Apr 15, 2013 at 10:33 AM, Pedro Alves <palves@redhat.com> wrote:
> On 04/13/2013 12:13 AM, Doug Evans wrote:
>> Hi.
>>
>> These two tests are failing for me.
>> They make the assumption that debug info for libc isn't installed.
>>
>> To fix this I've created a library of wrappers for the affected libc
>> functions and compiled it without debug info.
>>
>> Ok to check in?
>
> This the certainly the right idea for fixing the problem, but it took me a
> while to realize that the fact that the functions currently called are
> printf and sleep, and that the new library has wrappers for those has no
> importance. They really are just used as proxy for "functions in library
> with no debug info". Not even the output of printf is used. I think that
> calling the library a syscall wrapper makes it prone to causing such doubt
> and confusion in other readers (of either the patch or the resulting code
> in the tree), as it has caused me.
>
> How about we just call it "shr1", and have it export some non-libc related
> functions like e.g., "shr1_foo" and "shr1_bar"?
Blech. That's how I originally had it.
The original code used printf and sleep and I figured someone would
want to keep them.
I don't have a preference for either way. Anyone else?
In any case we need to document that one cannot call libc functions
(or similar) as is.
>> int main ()
>> @@ -27,16 +31,25 @@ int main ()
>> char* cptr = "String 1";
>> int b[2] = {5,8};
>>
>> + /* Call these functions once before we start testing so that they get
>> + resolved by the dynamic loader. If the system has debug info for
>> + the dynamic loader installed, reverse-stepping for the first call
>> + will otherwise record being in the dynamic loader, which is not what
>
> reverse-stepping doesn't record. Did you mean "report", or even
> "reverse-stepping the first call will otherwise stop in the
> dynamic loader", perhaps?
Yeah.
commit c2a96e8cafeeda6132399e9ea94dafad6366ccc5
Author: Doug Evans <dje@google.com>
Date: Mon May 6 22:07:13 2013 +0000
* gdb.reverse/shr.h: New file.
* gdb.reverse/shr1.c: New file.
* gdb.reverse/shr2.c: #include "shr.h".
* gdb.reverse/solib-reverse.c: Remove #include <stdio.h>.
#include "shr.h". Replace calls to printf,sleep to call shr1 instead.
* gdb.reverse/solib-precsave.exp: Build shr2.sl.
Update tests using sleep/printf to use shr2.sl instead.
* gdb.reverse/solib-reverse.exp: Ditt.o
Index: gdb-7.6.1/gdb/testsuite/gdb.reverse/shr1.c
===================================================================
--- /dev/null
+++ gdb-7.6.1/gdb/testsuite/gdb.reverse/shr1.c
@@ -0,0 +1,24 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "shr.h"
+
+void
+shr1 (const char *s)
+{
+ /* nothing to do */
+}
Index: gdb-7.6.1/gdb/testsuite/gdb.reverse/shr2.c
===================================================================
--- gdb-7.6.1.orig/gdb/testsuite/gdb.reverse/shr2.c
+++ gdb-7.6.1/gdb/testsuite/gdb.reverse/shr2.c
@@ -15,6 +15,8 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
+#include "shr.h"
+
#ifdef PROTOTYPES
int shr2(int x)
#else
Index: gdb-7.6.1/gdb/testsuite/gdb.reverse/shr.h
===================================================================
--- /dev/null
+++ gdb-7.6.1/gdb/testsuite/gdb.reverse/shr.h
@@ -0,0 +1,24 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef GDB_REVERSE_SHR_H
+#define GDB_REVERSE_SHR_H
+
+extern void shr1 (const char *);
+extern int shr2 (int);
+
+#endif /* GDB_REVERSE_SHR_H */
Index: gdb-7.6.1/gdb/testsuite/gdb.reverse/solib-precsave.exp
===================================================================
--- gdb-7.6.1.orig/gdb/testsuite/gdb.reverse/solib-precsave.exp
+++ gdb-7.6.1/gdb/testsuite/gdb.reverse/solib-precsave.exp
@@ -26,20 +26,30 @@ if {[skip_shlib_tests]} {
standard_testfile solib-reverse.c
set precsave [standard_output_file solib.precsave]
-set libfile "shr2"
-set libsrc ${libfile}.c
-set library [standard_output_file ${libfile}.sl]
+set lib1file "shr1"
+set lib1src ${lib1file}.c
+set library1 [standard_output_file ${lib1file}.sl]
+set lib2file "shr2"
+set lib2src ${lib2file}.c
+set library2 [standard_output_file ${lib2file}.sl]
if [get_compiler_info] {
return -1
}
-if { [gdb_compile_shlib ${srcdir}/${subdir}/${libsrc} ${library} "debug"] != "" } {
- untested "Could not compile shared library."
+# Compile the first without debug info so that
+# stepping and reverse stepping doesn't end up inside them.
+if { [gdb_compile_shlib ${srcdir}/${subdir}/${lib1src} ${library1} ""] != "" } {
+ untested "Could not compile shared library1."
return -1
}
-set exec_opts [list debug shlib=${library}]
+if { [gdb_compile_shlib ${srcdir}/${subdir}/${lib2src} ${library2} "debug"] != "" } {
+ untested "Could not compile shared library2."
+ return -1
+}
+
+set exec_opts [list debug shlib=${library1} shlib=${library2}]
# Attempt to prevent -Wl,-z,relro which may happen by default with some
# toolchain configurations. Due to PR corefiles/11804 GDB will then produce
@@ -57,12 +67,17 @@ if { [gdb_compile ${srcdir}/${subdir}/${
gdb_exit
gdb_start
-# Clear it to never find any separate system debug infos.
-gdb_test_no_output "set debug-file-directory"
+# Note: The test previously did "set debug-file-directory" to (try to)
+# ensure the debug info for the dynamic loader and libc weren't found.
+# This doesn't work if the debug info is in the .debug subdirectory.
+# Avoiding debug info for system libraries is not germaine to this test
+# and is no longer attempted. Instead, the test does not make assumptions
+# about whether the debug info is present or not.
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
-gdb_load_shlibs $library
+gdb_load_shlibs $library1
+gdb_load_shlibs $library2
runto main
@@ -99,15 +114,10 @@ set end_part_one [gdb_get_line_number "
set end_part_two [gdb_get_line_number " end part two" "$srcfile"]
gdb_test "until $end_part_one" " end part one.*" "run until end part one"
-gdb_test "reverse-step" " sleep three .*" "reverse-step third sleep"
-gdb_test "reverse-step" " sleep two .*" "reverse-step second sleep"
-gdb_test "reverse-step" " sleep one .*" \
- "reverse-step first sleep, dynsym resolve"
-
-gdb_test "reverse-step" " printf three .*" "reverse-step third printf"
-gdb_test "reverse-step" " printf two .*" "reverse-step second printf"
-gdb_test "reverse-step" " printf one .*" \
- "reverse-step first printf, dynsym resolve"
+gdb_test "reverse-step" " shr1 three .*" "reverse-step third shr1"
+gdb_test "reverse-step" " shr1 two .*" "reverse-step second shr1"
+gdb_test "reverse-step" " shr1 one .*" "reverse-step first shr1"
+
gdb_test "reverse-step" " generic statement.*" "reverse-step generic"
@@ -119,15 +129,10 @@ gdb_test "reverse-step" " generic statem
gdb_test "until $end_part_one" " end part one.*" "forward to end part one"
-gdb_test "reverse-next" " sleep three .*" "reverse-next third sleep"
-gdb_test "reverse-next" " sleep two .*" "reverse-next second sleep"
-gdb_test "reverse-next" " sleep one .*" \
- "reverse-next first sleep, dynsym resolve"
-
-gdb_test "reverse-next" " printf three .*" "reverse-next third printf"
-gdb_test "reverse-next" " printf two .*" "reverse-next second printf"
-gdb_test "reverse-next" " printf one .*" \
- "reverse-next first printf, dynsym resolve"
+gdb_test "reverse-next" " shr1 three .*" "reverse-next third shr1"
+gdb_test "reverse-next" " shr1 two .*" "reverse-next second shr1"
+gdb_test "reverse-next" " shr1 one .*" "reverse-next first shr1"
+
gdb_test "reverse-next" " generic statement.*" "reverse-next generic"
@@ -135,11 +140,11 @@ gdb_test "reverse-next" " generic statem
# Test reverse-step into debuggable solib function
#
-gdb_test "reverse-step" "${libsrc}.*" "reverse-step into solib function one"
+gdb_test "reverse-step" "${lib2src}.*" "reverse-step into solib function one"
gdb_test "reverse-step" "return 2.x.*" "reverse-step within solib function one"
gdb_test "reverse-step" " middle part two.*" "reverse-step back to main one"
-gdb_test "reverse-step" "${libsrc}.*" "reverse-step into solib function two"
+gdb_test "reverse-step" "${lib2src}.*" "reverse-step into solib function two"
gdb_test "reverse-step" "return 2.x.*" "reverse-step within solib function two"
gdb_test "reverse-step" " begin part two.*" "reverse-step back to main two"
Index: gdb-7.6.1/gdb/testsuite/gdb.reverse/solib-reverse.c
===================================================================
--- gdb-7.6.1.orig/gdb/testsuite/gdb.reverse/solib-reverse.c
+++ gdb-7.6.1/gdb/testsuite/gdb.reverse/solib-reverse.c
@@ -15,28 +15,33 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
-/* Test reverse debugging of shared libraries. */
+/* Test reverse debugging of shared libraries.
-#include <stdio.h>
+ N.B. Do not call system routines here, we don't want to have to deal with
+ whether or not there is debug info present for them. */
-/* Shared library function */
-extern int shr2(int);
+#include "shr.h"
int main ()
{
char* cptr = "String 1";
int b[2] = {5,8};
+ /* Call these functions once before we start testing so that they get
+ resolved by the dynamic loader. If the system has debug info for
+ the dynamic loader installed, reverse-stepping for the first call
+ will otherwise stop in the dynamic loader, which is not what we want. */
+ shr1 ("");
+ shr2 (0);
+
b[0] = shr2(12); /* begin part two */
b[1] = shr2(17); /* middle part two */
b[0] = 6; b[1] = 9; /* generic statement, end part two */
- printf ("message 1\n"); /* printf one */
- printf ("message 2\n"); /* printf two */
- printf ("message 3\n"); /* printf three */
- sleep (0); /* sleep one */
- sleep (0); /* sleep two */
- sleep (0); /* sleep three */
+
+ shr1 ("message 1\n"); /* shr1 one */
+ shr1 ("message 2\n"); /* shr1 two */
+ shr1 ("message 3\n"); /* shr1 three */
return 0; /* end part one */
} /* end of main */
Index: gdb-7.6.1/gdb/testsuite/gdb.reverse/solib-reverse.exp
===================================================================
--- gdb-7.6.1.orig/gdb/testsuite/gdb.reverse/solib-reverse.exp
+++ gdb-7.6.1/gdb/testsuite/gdb.reverse/solib-reverse.exp
@@ -24,20 +24,30 @@ if {[skip_shlib_tests]} {
}
standard_testfile
-set libfile "shr2"
-set libsrc ${libfile}.c
-set library [standard_output_file ${libfile}.sl]
+set lib1file "shr1"
+set lib1src ${lib1file}.c
+set library1 [standard_output_file ${lib1file}.sl]
+set lib2file "shr2"
+set lib2src ${lib2file}.c
+set library2 [standard_output_file ${lib2file}.sl]
if [get_compiler_info] {
return -1
}
-if { [gdb_compile_shlib ${srcdir}/${subdir}/${libsrc} ${library} "debug"] != "" } {
- untested "Could not compile shared library."
+# Compile the first without debug info so that
+# stepping and reverse stepping doesn't end up inside them.
+if { [gdb_compile_shlib ${srcdir}/${subdir}/${lib1src} ${library1} ""] != "" } {
+ untested "Could not compile shared library1."
return -1
}
-set exec_opts [list debug shlib=${library}]
+if { [gdb_compile_shlib ${srcdir}/${subdir}/${lib2src} ${library2} "debug"] != "" } {
+ untested "Could not compile shared library2."
+ return -1
+}
+
+set exec_opts [list debug shlib=${library1} shlib=${library2}]
if { [gdb_compile ${srcdir}/${subdir}/${srcfile} ${binfile} executable $exec_opts] != "" } {
untested "Could not compile $binfile."
@@ -49,12 +59,17 @@ if { [gdb_compile ${srcdir}/${subdir}/${
gdb_exit
gdb_start
-# Clear it to never find any separate system debug infos.
-gdb_test_no_output "set debug-file-directory"
+# Note: The test previously did "set debug-file-directory" to (try to)
+# ensure the debug info for the dynamic loader and libc weren't found.
+# This doesn't work if the debug info is in the .debug subdirectory.
+# Avoiding debug info for system libraries is not germaine to this test
+# and is no longer attempted. Instead, the test does not make assumptions
+# about whether the debug info is present or not.
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
-gdb_load_shlibs $library
+gdb_load_shlibs $library1
+gdb_load_shlibs $library2
runto main
@@ -73,15 +88,10 @@ set end_part_one [gdb_get_line_number "
set end_part_two [gdb_get_line_number " end part two" "$srcfile"]
gdb_test "until $end_part_one" " end part one.*" "run until end part one"
-gdb_test "reverse-step" " sleep three .*" "reverse-step third sleep"
-gdb_test "reverse-step" " sleep two .*" "reverse-step second sleep"
-gdb_test "reverse-step" " sleep one .*" \
- "reverse-step first sleep, dynsym resolve"
-
-gdb_test "reverse-step" " printf three .*" "reverse-step third printf"
-gdb_test "reverse-step" " printf two .*" "reverse-step second printf"
-gdb_test "reverse-step" " printf one .*" \
- "reverse-step first printf, dynsym resolve"
+gdb_test "reverse-step" " shr1 three .*" "reverse-step third shr1"
+gdb_test "reverse-step" " shr1 two .*" "reverse-step second shr1"
+gdb_test "reverse-step" " shr1 one .*" "reverse-step first shr1"
+
gdb_test "reverse-step" " generic statement.*" "reverse-step generic"
@@ -93,15 +103,10 @@ gdb_test "reverse-step" " generic statem
gdb_test "until $end_part_one" " end part one.*" "forward to end part one"
-gdb_test "reverse-next" " sleep three .*" "reverse-next third sleep"
-gdb_test "reverse-next" " sleep two .*" "reverse-next second sleep"
-gdb_test "reverse-next" " sleep one .*" \
- "reverse-next first sleep, dynsym resolve"
-
-gdb_test "reverse-next" " printf three .*" "reverse-next third printf"
-gdb_test "reverse-next" " printf two .*" "reverse-next second printf"
-gdb_test "reverse-next" " printf one .*" \
- "reverse-next first printf, dynsym resolve"
+gdb_test "reverse-next" " shr1 three .*" "reverse-next third shr1"
+gdb_test "reverse-next" " shr1 two .*" "reverse-next second shr1"
+gdb_test "reverse-next" " shr1 one .*" "reverse-next first shr1"
+
gdb_test "reverse-next" " generic statement.*" "reverse-next generic"
@@ -109,11 +114,11 @@ gdb_test "reverse-next" " generic statem
# Test reverse-step into debuggable solib function
#
-gdb_test "reverse-step" "${libsrc}.*" "reverse-step into solib function one"
+gdb_test "reverse-step" "${lib2src}.*" "reverse-step into solib function one"
gdb_test "reverse-step" "return 2.x.*" "reverse-step within solib function one"
gdb_test "reverse-step" " middle part two.*" "reverse-step back to main one"
-gdb_test "reverse-step" "${libsrc}.*" "reverse-step into solib function two"
+gdb_test "reverse-step" "${lib2src}.*" "reverse-step into solib function two"
gdb_test "reverse-step" "return 2.x.*" "reverse-step within solib function two"
gdb_test "reverse-step" " begin part two.*" "reverse-step back to main two"